tiny motor inside cell phone

[zak]

my cell phone damaged, i was about to throw it away but was curious how it vibrates, searching google and it turns that it is a tiny motor inside with a weight attached to its axe.
at first i can't found it, but using a tiny compass i found it burried inside a small bulk of plastic with its contact thin wires, it is only 1 cm long, look its picture below.
i have soldered its poles with a thicker wires, and it rotates speedy with just 1.5 v exhausted battery. your kid can use it in a school project, or for you just for fun.

http://i56.tinypic.com/a29p29.jpg

[Petr Schreiber]

Thank Zak,

that is very nice observation. Once my cell phone passes out, I will try to extract the motor as well :)


Petr

[danbaron]

I thought about that before too, zak.

I wondered how it vibrated.

I wondered if the vibration used a lot of electricity.

I guess I thought there had to be something moving back and forth inside. Now, you have found that instead, there is a rotating weight.

It's good.

:eusaclap:

[zak]

Hi Dan
the massage devices also have a motor with weight, the vibrational facility in cell phones normally used by females in a more creative and intelligent way, just google.
most home devices have toys inside. as an example , if you have an old computer with a damaged hard disk we can extract a super magnet from the hard disk very powerfull called neodymium supermagnets http://amasci.com/neodemo.html
yes we can buy such magnets in different shapes, but it is available already in hard disks, and some CD players. its is usualy glued slightly to iron holder, my magnets are two over each other by a 1 millimeter, look at the picture, a coil is moving back and forth inside this gap, the coil attached to a moving arm in which its farthest tip contains the sensing material. it is a real miracle, or course billions of dollars ibm, seagate and western digital spent to develop such devices.
it too powerfull that it is already harm my finger when struck suddenly together.

http://i53.tinypic.com/10faknq.jpg

the most hard step is to open the hard disk cover, it has a very small screws with unconventional head. look at my case:

http://i54.tinypic.com/xfsx0l.jpg

it is better to use a special screwdriver than the tip of a knife.
the supermagnets can repel water and graphite slightly, i have tried it with a small piece of an apple hanged from a thread and it repels it instead of attracting it like iron, by a propery of water called diamagnetism.
many other toys can be extracted from the hard disk, and from cell phones, and other devices.

[danbaron]

http://www.irm.umn.edu/hg2m/hg2m_b/hg2m_b.html

Like for gravity, the magnetic force can be written in the form,

F = c / r^2.

So, when the distance between objects is divided by two, the force between them is multiplied by four.

That is why it can be really dangerous to play with a big magnet.

If I remember correctly, people have been killed by MRI machines, when metal objects were unintentionally left in the room.

http://www.nytimes.com/2005/08/19/health/19magnet.html

Guitar amplifier speakers also have big magnets. You can get a big surprise when holding a screwdriver inside the back of the box.

Those are nice pictures, zak. You must have a camera microscope.

:idea:

[kryton9]

Cool thread and info.

I have 2 cell phones waiting for me to tear them apart. I am hoping to make one of each of these bots.


This is a neat design and made with simple household items.
http://www.youtube.com/watch?v=cUO4IXOu9wQ&feature=related

This uses a toothbrush:
http://www.youtube.com/watch?v=4_4POEtLd_4&feature=related